Purchased a 0 MOA cantilever mount for a S&B 4-16X50 Klassik scope. To zero at 100 yards, uses up almost all my elevation. Was told by S&B rep that due to limited adjustment with that scope, when using it on an AR, that I need a 10 MOA mount. The only two I can find that make a 10 MOA is LaRue and ERA-TAC. Are there more choices in a 10 MOA mount ? Doesn't need to be detachable. The other suggestion was to use Burris signature rings and try different posi-align inserts. Any help would be appreciated.
Help with AR15 mount
- Thread starter neal511
- Start date
You may want to think about that, please explain how an essentially 0 moa flat top AR (presumably) and a 0 Moa scope mount would use up all the elevation of a scope?
He’s used all the elevation he has to get the bullet up to the target. A 10 mil base will drop the POI 10 mil. But he he’s only got 11” of adjustment now he’ll have the opposite problem.
Even with extremely limited elevation adjustments a O moa mount and 0 moa rail should work just fine at a 100 yard zero. Main purpose of added MOA mounts is to extend your range of adjustments for distance. Added MOA Cantilever AR Mounts tip forward not backward when mounted properly.... and will only compound the issue....
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OP, is there really only 10 MOA of total adjustment? Sounds awfully poor, perhaps only 10 MOA in turret rotation? I'm only familiar with the PMIIs, but I would suspect a 30mm tube would have more than 10 MOA of total movement range.
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Ok, so... at 100yds when you dial the elevation up 10"/25.4cm (9.6MOA/2.8MRAD) so that the point of impact and the point of aim are now the same...how much total elevation travel is left? Or are you running out of elevation before you can even match the point of impact and point of aim?
edited: cause math is hard
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Do you have enough to zero if you put a 10 mil on it? You’d need damn near 30” the other way so if you have to come up from center 10 MOA and only have another 3.5 you’ll run out before you zero a 10 mil mount. I’d get a different optic.
You need a 20 or 30 MOA Mount. Spuhr, KAC, ADM, Geissele all make such mounts. Also think Nightforce does as well...if the Mount only comes in versions for 34mm scopes, buy LaRue’s ring reducer kit.
Hmm, if you truly only have 3-3.5" left your likely need to look at another optic. only 30cm or whatever of total internal travel is just about useless...for, well...any thing really. It's boggling my mind that anyone would make one actually.
Also I'll eat Crow, KTAK was right, adding a cantilever mount is just likely to compound the issue.
The Burris signature rings will give you the most fine tuning and the ability to get the most out of what appears to be a very limited scope. Plus they won't break the bank.
Option 2 is sell the scope and buy something more fitting for an AR.
Option 2 is sell the scope and buy something more fitting for an AR.
I was told by Jerry at Schmidt&Bender in Virginia that if I used a 20 moa mount it would be too much. He said a 10 MOA would let me set my elevation at the center of its travel and would give me about 10 moa up or down from there. I just wanted to make sure since I have little experience with shooting much past 250 yards. I just bought the scope and am sure I would lose way to much money if I sold it! I also already have an AR set up with a lower power scope (2-8) and really don't need a second one set up the same.
This is an easy decision. What round are you shooting, what velocity, and how far do you want to shoot?
ETA: if a 10 MOA mount gets you 13.5 MOA of adjustment at 100 and your shooting 77 grn Nosler custom comps at 2,600 FPS you’ll max out between 375-425 meters.
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You would be able to dial to 500 yards with both of those if you have 13.5 MOA of adjustment.
Have you tried a 36 yard zero? If so, do you have more elevation travel?
You mentioned not getting a more-AR appropriate optic isn’t an option right now so perhaps we can help you work with what you have.
I zero my Mk18 at 36 yards...at 300 yards, my point of aim = point of impact. At 200 yards I hold low by a foot (if shooting at an E type, I hold at the belly button to hit high center of mass).
if a 36 yard zero results in more elevation travel, you won’t have to actually touch the knob until you’re shooting beyond 300. perhaps you can free up enough elevation to get you to 500, which is plenty for most 5.56 NATO platforms.
edit:: given you have a Duplex, try zeroing at the top of the duplex at 36 then use the rest of the reticle to hold over once you get beyond 300.
I found I have a total of 30 moa elevation adjustment. From the optical center that leaves me about 15 up or down. Because POI @ 100yds is approx between 8.5 and 10" low,depending on load, that is only leaving me 5 moa with a 0 moa mount. A 20moa mount seems like it would be just the opposite problem. So I ordered the Burris XTR signature rings to try. With the posi align inserts they allow 0-40 moa of adjustment. It will be awhile before I can get back to the range, but thank you for all the responses.
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